SplStack vs SplQueue

queue-vs-stack.sh

echo SplStack
echo ========

echo php 5.5
echo -------
for i in $(seq 10); do
    time php5.5 -d memory_limit=-1 -n spl-stack.php
done

echo php 5.6
echo -------
for i in $(seq 10); do
    time php5.6 -d memory_limit=-1 -n spl-stack.php
done

echo php 7.0
echo -------
for i in $(seq 10); do
    time php7.0 -d memory_limit=-1 -n spl-stack.php
done

echo SplQueue
echo ========

echo php 5.5
echo -------
for i in $(seq 10); do
    time php5.5 -d memory_limit=-1 -n spl-queue.php
done

echo php 5.6
echo -------
for i in $(seq 10); do
    time php5.6 -d memory_limit=-1 -n spl-queue.php
done

echo php 7.0
echo -------
for i in $(seq 10); do
    time php7.0 -d memory_limit=-1 -n spl-queue.php
done

results.txt

SplStack
========
php 5.5
-------
int(964954848)

real	0m2.689s
user	0m2.498s
sys	0m0.191s
int(964954848)

real	0m2.692s
user	0m2.501s
sys	0m0.191s
int(964954848)

real	0m2.707s
user	0m2.512s
sys	0m0.195s
int(964954848)

real	0m2.680s
user	0m2.494s
sys	0m0.186s
int(964954848)

real	0m2.777s
user	0m2.606s
sys	0m0.171s
int(964954848)

real	0m2.717s
user	0m2.566s
sys	0m0.152s
int(964954848)

real	0m2.694s
user	0m2.534s
sys	0m0.160s
int(964954848)

real	0m2.703s
user	0m2.534s
sys	0m0.168s
int(964954848)

real	0m2.681s
user	0m2.507s
sys	0m0.174s
int(964954848)

real	0m2.753s
user	0m2.566s
sys	0m0.187s
php 5.6
-------
int(964954848)

real	0m2.689s
user	0m2.514s
sys	0m0.175s
int(964954848)

real	0m2.700s
user	0m2.533s
sys	0m0.167s
int(964954848)

real	0m2.713s
user	0m2.526s
sys	0m0.187s
int(964954848)

real	0m2.689s
user	0m2.510s
sys	0m0.179s
int(964954848)

real	0m2.700s
user	0m2.526s
sys	0m0.175s
int(964954848)

real	0m2.708s
user	0m2.550s
sys	0m0.158s
int(964954848)

real	0m2.698s
user	0m2.514s
sys	0m0.184s
int(964954848)

real	0m2.684s
user	0m2.535s
sys	0m0.149s
int(964954848)

real	0m2.716s
user	0m2.537s
sys	0m0.179s
int(964954848)

real	0m2.850s
user	0m2.680s
sys	0m0.170s
php 7.0
-------
int(402651320)

real	0m1.970s
user	0m1.947s
sys	0m0.023s
int(402651320)

real	0m1.971s
user	0m1.953s
sys	0m0.018s
int(402651320)

real	0m1.969s
user	0m1.950s
sys	0m0.019s
int(402651320)

real	0m1.976s
user	0m1.949s
sys	0m0.027s
int(402651320)

real	0m1.973s
user	0m1.954s
sys	0m0.019s
int(402651320)

real	0m1.977s
user	0m1.963s
sys	0m0.014s
int(402651320)

real	0m1.975s
user	0m1.952s
sys	0m0.023s
int(402651320)

real	0m1.979s
user	0m1.954s
sys	0m0.024s
int(402651320)

real	0m1.972s
user	0m1.943s
sys	0m0.029s
int(402651320)

real	0m1.983s
user	0m1.964s
sys	0m0.018s
SplQueue
========
php 5.5
-------
int(964954848)

real	0m2.680s
user	0m2.496s
sys	0m0.184s
int(964954848)

real	0m2.702s
user	0m2.519s
sys	0m0.183s
int(964954848)

real	0m2.682s
user	0m2.522s
sys	0m0.160s
int(964954848)

real	0m2.691s
user	0m2.507s
sys	0m0.184s
int(964954848)

real	0m2.732s
user	0m2.554s
sys	0m0.178s
int(964954848)

real	0m2.683s
user	0m2.528s
sys	0m0.155s
int(964954848)

real	0m2.846s
user	0m2.678s
sys	0m0.168s
int(964954848)

real	0m2.711s
user	0m2.546s
sys	0m0.165s
int(964954848)

real	0m2.697s
user	0m2.549s
sys	0m0.148s
int(964954848)

real	0m2.706s
user	0m2.524s
sys	0m0.182s
php 5.6
-------
int(964954848)

real	0m2.705s
user	0m2.521s
sys	0m0.184s
int(964954848)

real	0m2.711s
user	0m2.546s
sys	0m0.165s
int(964954848)

real	0m2.708s
user	0m2.543s
sys	0m0.165s
int(964954848)

real	0m2.759s
user	0m2.596s
sys	0m0.163s
int(964954848)

real	0m2.685s
user	0m2.493s
sys	0m0.192s
int(964954848)

real	0m2.699s
user	0m2.531s
sys	0m0.170s
int(964954848)

real	0m2.682s
user	0m2.498s
sys	0m0.184s
int(964954848)

real	0m2.719s
user	0m2.538s
sys	0m0.181s
int(964954848)

real	0m2.702s
user	0m2.517s
sys	0m0.185s
int(964954848)

real	0m2.712s
user	0m2.550s
sys	0m0.162s
php 7.0
-------
int(402651320)

real	0m2.280s
user	0m2.263s
sys	0m0.017s
int(402651320)

real	0m2.937s
user	0m2.919s
sys	0m0.018s
int(402651320)

real	0m1.977s
user	0m1.957s
sys	0m0.019s
int(402651320)

real	0m1.971s
user	0m1.949s
sys	0m0.022s
int(402651320)

real	0m1.974s
user	0m1.955s
sys	0m0.019s
int(402651320)

real	0m1.977s
user	0m1.955s
sys	0m0.023s
int(402651320)

real	0m1.970s
user	0m1.948s
sys	0m0.022s
int(402651320)

real	0m1.977s
user	0m1.952s
sys	0m0.025s
int(402651320)

real	0m1.971s
user	0m1.947s
sys	0m0.023s
int(402651320)

real	0m1.970s
user	0m1.946s
sys	0m0.024s

spl-queue.php

<?php
$start = memory_get_usage();
$all = [];
for ($j = 0; $j < 1e4; ++$j) {
    $all[$j] = new SplQueue();
    for ($i = 0; $i < 1e3; ++$i) {
        $all[$j][] = $i;
    }
}

var_dump(memory_get_usage() - $start);

spl-stack.php

<?php
$start = memory_get_usage();
$all = [];
for ($j = 0; $j < 1e4; ++$j) {
    $all[$j] = new SplStack();
    for ($i = 0; $i < 1e3; ++$i) {
        $all[$j][] = $i;
    }
}

var_dump(memory_get_usage() - $start);

stats.txt

	SplStack				SplQueue		

	php 5.5	php 5.6	php 7.0		php 5.5	php 5.6	php 7.0
Runs							
#1	2,498	2,514	1,947		2,496	2,521	2,263
#2	2,501	2,533	1,953		2,519	2,546	2,919
#3	2,512	2,526	1,95		2,522	2,543	1,957
#4	2,494	2,51	1,949		2,507	2,596	1,949
#5	2,606	2,526	1,954		2,554	2,493	1,955
#6	2,566	2,55	1,963		2,528	2,531	1,955
#7	2,534	2,514	1,952		2,678	2,498	1,948
#8	2,534	2,535	1,954		2,546	2,538	1,952
#9	2,507	2,537	1,943		2,549	2,517	1,947
#10	2,566	2,68	1,964		2,524	2,55	1,946
							
Average :	2,5318	2,5425	1,9529		2,5423	2,5333	2,0791
Median :	2,523	2,5295	1,9525		2,526	2,5345	1,9535
Standard deviation :	0,0370908794	0,0498492171	0,0065396228		0,0510926174	0,029401625	0,31098319